Sheet-metal flooring.



Patented Sept; [8, I900.

F. VOIGTMANN.

SHEET METAL FLOORING.

(Application filed Sept. 15, 189B. Renewed July 30, 1900.)

(No Model.)

UNITED STATES PATENT OFFICE.

FRANK VOIGTMANN, on oHIoAGo, ILLINOIS.

SHEET-M ETAL' FLOORING.

SPECIFICATION formingmt of Letters Patent Ne. 657,995, dated. September .18, 1960. Applib'ati n filed- Septeinbr 189B. Renewed Juljf 1900. herial No. 26,349. No moclela) To all whom it may concern.-

Be it known that I, FRANK VOIG'IMANN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illi= nois, have invented a new and useful Improvement in Sheet-Metal Flooring, of which the following is a specification.

The object of my invention is to provide a sheet-metal flooring of such a form that concrete may be laid upon it and held securely to it when the concrete hardens.

It consists, broadly, of sheet metal bent in ridges, having a space between the ridges which is wider below than above.

It further consists of details hereinafter more fully described,and particularly pointed out in the claims.

Figure 1 is a sectional View of my flooring. Fig. 2 is a perspective view of the same.

A represents the sheet metal; B, the joist upon which the floor rests; O, the concrete which is laid upon the floor.

The sheet metal is bent into such form as to bring a fiat portion D upon the joist as a supporting-base, inclined portions E E for vertical strength, and the offset portions F F for vertical strength and to form a retainingkey for the concrete. It is found in practice that the concrete is apt to crack with the expansion and contraction ofthe metal floor by the changes in temperature and to come up. By making the space between the ridges larger below than above in themanner I have shown the concrete is prevented from coming out, being keyed down in place. This space between the ridges is V-shaped, so as to present the least possible flat metal surface near the surface of the floor whereby the concrete would be made fragile and liable to break away.

What I claim, and desire to secure by Letters Patent, is-

1. The herein-described flooring, consisting of the combination of the sheet metal bent in V-shaped ridges, said ridges having projecting ridges upon them which restrict the space between the first-mentioned ridges making said space greater below than above them to form a key, and the concrete upon said sheet metal which fills said space between said ridges, all substantially as shown and described.

2. In a composition flooring the herein-described sheet-metal plate for holding the concrete, having the flat base portion D, the inclined portions E, E, and the offset portions F, F, all substantially as shown and described.

FRANK VOIGTMANN.

Witnesses:

WILLIAM F. NITTEL, LoUIs V. LE MOYNE. 

